Skip to main content

Contour lines and Terrain

๐Ÿšงย This article is incomplete

This article is incomplete & needs to be reviewed. You can help by creating a pull request.

Terrain information such as Contour lines, Hillshades, and Slopes - helps you visually assess the shape of the land surface, considering curvature, extremes, steepness, points of equal height, and more.

Overviewโ€‹

The Contour Lines plugin is a separate function that can be enabled/disabled as needed. The plugin provides for downloading the following maps:

  • the Contour lines map in vector points, and
  • two Terrain maps in raster pixels:
    • Hillshade map.
    • Slopes map.

Contour lines and Terrain

Each map in the Contour Lines plugin is an independent option that appears above or below the map source when enabled, depending on the settings.

Topographic information on a map can be represented by slope shading, contour lines for the uphill and downhill, and the colour of the slope angle deviation from flat. Use contour lines, shading, and colours to show slopes, peaks, rugged terrain, and other altitudes on a map.

Setupโ€‹

To display Contour line and Terrain data on the map, you must make the following settings:

  1. Purchase any of the maps of the Coutour lines.
  2. Enable the Coutour lines plugin in the Plugins section of the main menu.
  3. Download Contour lines and/or Terrain maps for the required regions.
  4. Include Contour lines and/or relief maps for each profile.
  5. Adjust the map view if necessary.

Data sourceโ€‹

The altitude data on the map - between 70 degrees north latitude and 70 degrees south latitude - are from measurements made by the Shuttle Radar Topography Mission (abbreviated SRTM). It used the Advanced Spaceborne Thermal Emission and Reflection Radiometer (abbreviated ASTER), which is a sensor onboard the Terra satellite and the primary imaging tool in NASA's Earth Observation System. ASTER is a joint effort between NASA, the Japanese Ministry of Economy, Trade, and Industry (abbreviated METI), and Japan Space Systems (also known as J-spacesystems).

Link to the License.

Purchase and enable pluginโ€‹

To enable the plugin and start downloading contour lines, and/or Hillshade, and/or Slopes for each region, you must purchase the Contour Lines package.

Contour lines plug-in cards are distributed through In-App Purchases, subscriptions, and Android app purchases. For more information about available purchase options, visit Purchases.

After purchasing Contour lines, the plugin can be enabled as shown in the pictures below.

For purchases on Android, refer to in-app purchases, a subscription, or the full version of the app.
To view the already made purchases, go to: Menu โ†’ Settings โ†’ Purchases

In the Android version, to enable the plugin, tap Enable for Contour lines in: Menu โ†’ Plugins โ†’ Contour lines

Contour lines plugin on Android

Download Contour lines/Terrainโ€‹

General Information
Three types of elevation data packages can be loaded for each region: Contour Lines, Hillshade and Slope. Most often, they can all be downloaded at the country level. In addition, maps at a lower region level are available.

Consider country/region levelsโ€‹

By combining both levels and types of maps, you can achieve the optimal configuration of terrain data to meet your current needs.

For example, you can combine the Contour Lines region map of the island of Sicily and the slope map of Italy as one at the country level. Another example is Canada maps, where all three map types are available at the region level. And to display Slope and Contour lines data for Alberta, all you need to do is load two maps at the region level, respectively.

Hillshade over Sicily in Android Slope over Sicily in Androis

NOTE: Contour line colours, Hillshade, and Slope angle are available for viewing at a certain zoom level, which is set in the settings for a particular map type.

Combine map typesโ€‹

When loading different types of maps: Contour lines, Hillshade and/or Slope, consider combining them further.

For example, to estimate curvature, especially for a mountain range, the obvious choice to load would be a combination of Contour lines and Hillshade. And to estimate the steepness of a slope, points of equal height, you can display Slope and Contour lines maps together.

Contour lines combined with Hillshade Contour lines combined with Slope

NOTE: There is a colour legend that shows how each color corresponds to an angle of deviation from the plane. The legend is available in the Slope map settings.
Slope color legend

Choose Meters or Feetโ€‹

The contour interval can be displayed in feet, or meters. It is important to decide what units it is convenient for you to see Contour lines in, so that to download the respective version of the Contour lines map. The units are not interchangeable, and in case if feet are needed to be switched into meters, or vice versa, the previous version of the Contour lines map has to be removed, so that anew to download the other version.

The contour interval can be displayed in feet or meters. It is important to decide which units you are comfortable seeing Contour lines to load the appropriate version of the Contour line map. Units are not interchangeable, and if feet need to be converted to meters or vice versa, the previous version of the contour line map must be deleted to reload another version.

Contour lines download dialogue Android

How to downloadโ€‹

To download Contour lines, Hillshade, and/or Slope for a specific area, do the following:

  1. Go to Download maps menu.
  2. Find your country or region.
  3. Choose any of the packages:
    • Contour lines,
    • Hillshade, and/or
    • Slope.
  4. For Contour lines, select Meters, or Feet.
  5. Download the files.

In the Android version, to download any of the available packages of Contour lines, Hillshade, and/or Slope, do the following:

  1. Go to: Menu โ†’ Download maps โ†’ Regions
  2. Choose a country and pay attention to any of the following sections:
    2.1. The Regionwide maps section provides available packages with maps for the entire country. If needed, download ones.
    2.2. The Regions section lists the regions of the country. If to tap a region, there will be map packages available to download for the region.

Contour lines download Android

Show / Configure map viewโ€‹

Each of the maps: Hillshade, Slope, Contour lines can be configured to look visually different depending on personal preferences, and/or the context of a particular region, and/or other conditions. Use the context menu of the corresponding map option in the Configure Map menu to make the necessary changes in appearance.

Show Contour lines/Terrainโ€‹

Usually, as many packages of Contour lines, Hillshade and/or Slopes as needed for specific areas are loaded. After all the downloads are completed, you can determine which map types should be shown for a particular profile. There are two options for each profile - Contour lines and/or Terrain to enable per profile:

  • only Contour lines
  • only Terrain
  • both Contour lines and Terrain together.

For the Terrain option, only one map can be enabled at a time: either Hillshade or Slope. You can determine which of the two maps is currently enabled by opening the Terrain settings, where the switched option will be the one that is currently enabled.

CONTOUR LINESโ€‹

In the Android version, to show the Contour lines map for the selected profile and all downloaded areas, do the following:

  1. Go to: Menu โ†’ Configure map.
  2. Select a Profile, and look for the Show section of settings in the menu.
  3. Within the section, scroll down up to Contour lines, and toggle on the Contour lines option.

Terrain and Contour lines enable Android

TERRAINโ€‹

In the Android version, to show one of the Terrain maps for the selected profile and all downloaded areas, do the following:

  1. Go to: Menu โ†’ Configure map.
  2. Select a Profile, and look for the Show section in the menu.
  3. Within the section, scroll down up to Terrain, toggle on the Terrain option, and tap it, to open the context menu, see the figure below.
  4. Select one of the options: either Hillshade, or Slope.

Hillshade, or Slope options

NOTE: If after loading the corresponding map you do not see that Hillshade or Slope are enabled, restart the application.

Hillshade mapโ€‹

Hillshade allows you to explore topography by illuminating it with hypothetical lighting that simulates shadow casting, thus revealing curvature that would normally be hidden or obscured by, for example, large amounts of vegetation. Some aspects of the Hillshade map are available for configuration: the transparency of the shadow, and the zoom level at which the Hillshade map will be visible.

The Hillshade settings are available in the context menu of the Terrain option in the Configure map of a specific profile.

  • Terrain - switch to display or hide terrain elevation data to/from the map.
  • Hillshade / Slope - select to display one of the relief data types: either Hillshade or Slope.
  • Transparency - a percentage scale for determining the preferred level of transparency for the displayed shadow.
  • Zoom levels - two slider options to move to the left, or right, to determine:
    • the minimum zoom level at which Hillshade will be visible on the map.
    • the maximum zoom level at which it should disappear.
  • Download maps - suggests downloading the Hillshade package if it has not already been downloaded for the current geographic location shown on the screen.

Terrain menu Android

Slope mapโ€‹

The slope allows you to explore the steepness, or incline of a slope expressed as an angle in the number of degrees of deviation from the plane, which corresponds to the vertical distance divided by the horizontal distance. There are some aspects of the Slope map available for configuration: the transparency of the colours used to display the angle, and the zoom level at which the Slope map should be visible.

The Slope settings are available in the context menu of the Terrain option in the Configure map of a specific profile.

  • Terrain - switch to display or hide terrain elevation data to/from the map.
  • Hillshade / Slope - select to display one of the relief data types: either Hillshade or Slope.
  • Transparency - a percentage scale for determining the preferred level of transparency for the displayed shadow.
  • Zoom levels - minimum and maximum parameters to be tapped to select:
    • the minimum zoom level at which the colours of the Slopes will be visible on the map.
    • the maximum zoom level at which it should disappear.
  • Legend - the legend of colours to show the angle range at which the steepness of the slope can differ. For more details, refer to Wikipedia
  • Download maps - an offer to download a Slope package if none is still downloaded for the current geographical location displayed on the screen.

Terrain menu slopes Android

Contour lines mapโ€‹

Contour lines allow you to explore in which direction and how much the surface is sloped by analyzing Contour lines that are close for steep areas and more curved as you climb up. Several aspects of the contour line map are available for configuration: the minimum zoom level at which contour lines become visible, the color scheme, line width, and line density.

The Contour lines settings are available in the context menu of the Contour lines option in the Configure map of a specific profile.

  • On - a toggle to show, or hide the Contour lines on/from the map;
  • Display starting at zoom level - the minimum zoom level at which Contour lines is expected to be viewable on the map;
  • Color scheme - a choice of color options in which to view the Contour lines on the map;
  • Contour line width - a choice of the width options to establish for the Contour lines;
  • Contour line density - a choice of the density options to establish for the Contour lines. The higher the density, the slower the map might be rendered;
  • Download maps - an offer to download a Contour lines package if none is still downloaded for the current geographical location displayed on the screen.

Contour lines menu Android

Please see full video guide below: Link to Youtube